Answer:
64.15 mL.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and P are constant, and have two different values of V and T:V₁T₂ = V₂T₁
V₁ = 65.0 mL, T₁ = 92.4°C + 273 = 365.4 K.
V₂ = ??? mL, T₂ = 87.6°C + 273 = 360.6 K.
∴ V₂ = V₁T₂/T₁ = (65.0 mL)(360.6 K)/(365.4 K) = 64.15 mL.
What are the concentrations of hydroxide and hydronium ions in a solution with a pH of 8.3?
Answer:
[H⁺] = 5.012 x 10⁻⁹. & [OH⁻] = 1.995 x 10⁻⁶.
Explanation:
∵ pH = - log[H⁺]
8.3 = - log[H⁺]
∴ log[H⁺] = - 8.3.
∴ [H⁺] = 5.012 x 10⁻⁹.
∵ [H⁺][OH⁻] = 10⁻¹⁴.
∴ [OH⁻] = 10⁻¹⁴/[H⁺] = 10⁻¹⁴/(5.012 x 10⁻⁹) = 1.995 x 10⁻⁶.
Answer:
The correct answer is C.
Explanation:
I just got it correct on the test. I hope this helps!
Use the drop-down menus to identify the definition of radiation and the different types of radioactive emissions.
______is the process of emitting radiant energy in the form of waves or particles.
______is two protons and two neutrons bound together into a particle identical to a helium nucleus. is a negatively charged electron emitted by the nucleus.
______is the radioactive decay of an atom that releases a photon, which results from a redistribution of electric charge within a nucleus.
Alpha particle
Beta particle
Gamma ray
Radiation
Help me quickly please! I don't get it! T.T
Explanation:
Radiation is defined as an electromagnetic energy which travels in space in the form of waves or particles.
An alpha particles is basically a helium nucleus and it contains 2 protons and 2 neutrons.
Symbol of an alpha particle is [tex]^{4}_{2}\alpha[/tex].
A beta particle is a particle with a negatively charged electron. Symbol of a beta particle is [tex]^{0}_{-1}\beta[/tex].
A gamma particle is basically a photon of electromagnetic radiation with a short wavelength.
Symbol of a gamma particle is [tex]^{0}_{0}\gamma[/tex].
Therefore, we can conclude that the definition of radiation and the different types of radioactive emissions are as follows.
Radiation is the process of emitting radiant energy in the form of waves or particles.Alpha particle is two protons and two neutrons bound together into a particle identical to a helium nucleus.Beta particle is a negatively charged electron emitted by the nucleus.Gamma ray is the radioactive decay of an atom that releases a photon, which results from a redistribution of electric charge within a nucleus." Radiation is the process of emitting radiant energy in the form of waves or particles. An alpha particle is two protons and two neutrons bound together into a particle identical to a helium nucleus. A beta particle is a negatively charged electron emitted by the nucleus. A gamma ray is the radioactive decay of an atom that releases a photon, which results from a redistribution of electric charge within a nucleus.
Radiation is a broad term that refers to the emission of energy in the form of electromagnetic waves or subatomic particles. This energy is released by atoms that are unstable, known as radioactive atoms. The process of radiation can take several forms, each with its own characteristics:
- Alpha particle: This is a type of radioactive emission that consists of two protons and two neutrons. It is the largest and most energetic of the common emissions, but because of its size, it can be stopped by a few centimeters of air or a piece of paper. Alpha particles are essentially the nucleus of a helium atom, hence why they are identical to a helium nucleus.
- Beta particle: This emission is a high-energy electron that is ejected from the nucleus of an atom during certain types of radioactive decay. Beta particles are more penetrating than alpha particles and can travel through several meters of air or a few millimeters of aluminum.
- Gamma ray: Gamma rays are high-energy photons, which are packets of electromagnetic energy. They are emitted from a nucleus during radioactive decay and are the most penetrating of the common radioactive emissions. Gamma rays can travel through several centimeters of lead or several meters of concrete, making them difficult to shield against.
Each of these types of emissions is a form of ionizing radiation, meaning they have enough energy to remove tightly bound electrons from atoms, creating ions. This can lead to damage in living tissue, which is why radiation can be harmful to biological organisms. The definitions provided in the question help to distinguish between the different types of radioactive emissions and their properties."
If you have 3.00 of N2, how many moles of NH3 will be produced?
Answer:
4.50
Explanation:
3.00+1.50
The initial temperature of a bomb calorimeter is 28.50°C. When a chemist carries out a reaction in this calorimeter, its temperature decreases to 27.45°C. If the calorimeter has a mass of 1.400 kg and a specific heat of 3.52 J/(gi°C), how much heat is absorbed by the reaction? Use . 140 J 418 J 1,470 J 5,170 J
Answer:
5,170 J.
Explanation:
The amount of heat absorbed by the reaction = the amount of heat released from the calorimeter.the amount of heat released from the calorimeter (Q) can be calculated from the relation:Q = m.c.ΔT.
where, Q is the amount of heat released from the calorimeter (Q = ??? J),
m is the mass of the calorimeter (m = 1.4 kg = 1400.0 g),
c is the specific heat capacity of the calorimeter (c = 3.52 J/g °C),
ΔT is the temperature difference (final T - initial T) (ΔT = 27.45 - 28.50 = - 1.05°C).
∵ Q = m.c.ΔT.
∴ Q = m.c.ΔT = (1400.0 g)(3.52 J/g °C)(- 1.05°C) = - 5174.0 J ≅ - 5,170 J.
∴ The amount of heat absorbed by the reaction = 5,170 J.
Answer:
When 40.0 mL of 1.00 M H2SO4 is added to 80.0 mL of 1.00 M NaOH at 20.00°C in a coffee cup calorimeter, the temperature of the aqueous solution increases to 29.20°C. If the mass of the solution is 120.0 g and the specific heat of the calorimeter and solution is 4.184 J/g • °C, how much heat is given off in the reaction? (Ignore the mass of the calorimeter in the calculation.)
Use q equals m C subscript p Delta T..
4.62 kJ
10.0 kJ
14.7 kJ
38.5 kJExplanation:
4. How is photosynthesis a carbon storing process?
Carbon dioxide (CO2) in the atmosphere is necessary for plants and trees to grow. Forests play a specific and important role in the global carbon cycle by absorbingcarbon dioxide duringphotosynthesis, storing carbonabove- and belowground, and producing oxygen as a by-product of photosynthesis.
Photosynthesis is the process by which plants use sunlight to convert carbon dioxide and water into energy-storing carbohydrates and oxygen. This allows plants to store carbon in the form of glucose for growth and energy reserves, effectively removing carbon dioxide from the atmosphere.
Photosynthesis is a carbon storing process because it converts carbon dioxide from the atmosphere into energy-storing carbohydrates, such as glucose, which plants can then store for later use. The general equation for photosynthesis is:
6CO₂ + 6H₂O + light energy \rightarrow C₆H₁₂O₆ + 6O₂
During this process, solar energy is harnessed through the chloroplasts in the leaves of plants, initiating a series of reactions known as the Calvin cycle. These reactions convert atmospheric carbon dioxide and water in the presence of sunlight into glucose, which plants use to grow and thrive, or store for later energy needs. For example, sweet potatoes store carbohydrates in their roots, while aloe plants store them in their leaves, making these biological reserves an important aspect for both the plants and the ecosystems they support.
which statement is true of covalent bonds?
they form when atoms lose electrons.
they form when atoms gain electrons.
the form when electrons are shared.
they form when ions are attracted to each other.
They form when electrons are shared.
Covalent bonds form when atoms share their electrons mutually and equally or unequally depending on their electronegativity. This sharing allows atoms to stabilize and often achieve a noble gas electron configuration. Lewis electron dot diagrams help illustrate such bonds.
Explanation:Covalent bonds occur when electrons are shared between atoms, creating a mutual stabilization. Unlike ionic bonds which involve the exchange of electrons to form charged ions, covalent bonding is characterized by the sharing of one or more electron pairs. Each atom contributes an electron to the shared pair, resulting in a bond that is typically stronger than an ionic bond. This sharing of electrons allows each atom to attain a more stable electronic configuration, often resembling that of the nearest noble gas.
There are different types of covalent bonds, such as polar covalent bonds where the sharing of electrons is unequal due to differences in electronegativity between the bonded atoms. Conversely, nonpolar or pure covalent bonds involve equal sharing of electrons because of identical or very similar electronegativity values.
For visualization, Lewis electron dot diagrams are often used to illustrate how atoms bond covalently, with shared electron pairs represented by dashes connecting the symbols for the atoms.
PLEASE HELP!!!!!!!!Which of the following chemical reactions is best clasified as an acid-base reaction?
a
2HgO→2Hg + O2
b
Na2SO4 + BaCl2 →BaSO4 + 2NaCl
c
Zn + 2AgNO3 →Zn(NO3)2 + 2Ag
d
H2SO4 +2KOH →K2SO4 + 2H2O
Answer:
d . H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
Explanation:
The given reactions are:a . 2HgO → 2Hg + O₂,
It is a decomposition reaction, that HgO is decomposed to give Hg and O.
b . Na₂SO₄ + BaCl₂ → BaSO₄ + 2NaCl,
It is a double replacement reaction where two salts replaces their cations and anions with each others producing 2 new salts.
c . Zn + 2AgNO₃ → Zn(NO₃)₂ + 2Ag,
It is a single replacement reaction, that Zn replaces Ag from its salt.
d . H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
It is acid-base reaction "neutralization reaction" where H₂SO₄ (acid) reacts with KOH (base) producing K₂SO₄ (salt) and water.
So, the right choice is:
d . H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
How do you determine the number of protons in an element
Answer:
You determine the number of protons by its atomic number, just like electrons.
I am joyous to assist you anytime.
Find out Oxidizing and Reducing agent in the following REDBOX REACTIONS.
Answer:
Fe is the reducing agent while oxygen is the oxidizing agent
Explanation:
In the reaction above Iron loses electrons to form iron ions and this is called oxidation. Therefore, iron is the reducing agent which loses electrons and becomes oxidized to form Iron(iii) ion.On the other hand, Oxygen gains or accepts electrons and therefore, it undergoes reduction. This means oxygen is the reducing agent that accepts electrons and becomes reduced to oxygen ion.Which of the following can a cell contain?
1:) A number
2:) A word
3:) A function
4:) All of these
(my first guess was #3, just to be sure)
Answer: D. All of these
A cell contains of the options listed therefore it is D
Definitely 3 because a cell can contain many functions
Matter changes from one state to another when ____________ is added or removed.
Answer:
Heat
Explanation: When matter is heated enough, the molecules move faster and with greater energy. If enough heat is added, a solid can become liquid and a liquid can become gas. In the same way, molecules slow down when they are cooled.
thermal energy (heat) is added or removed
Which unit of measurement should be used for the vertical axis?
A. millimeters
B. centimeters
C. kilometers
D. decimeters
Answer:
b
Explanation:
A visual illustration used to show mathematical relationships is called a .
answer:
a visual illustration used to show mathematical relationships is a theory.
Answer:
Its a graph
Explanation:
You and your sister both have a small camping tent set up in the backyard. You each have two strings of lights to hang inside the tent. You power your lights with a 9-volt battery and your sister uses an extension cord and powers her lights from an electrical outlet on the deck.
What is the BEST conclusion the you can make about this situation?
A
Your lights shine the brightest because your battery produces less power.
B
Your lights shine the brightest because your battery produces more power.
C
Your sister's lights shine the brightest because the electrical outlet has less power.
D
Your sister's lights shine the brightest because the electrical outlet has more power.
Answer:
D
Your sister's lights shine the brightest because the electrical outlet has more power.
Explanation:
Your sister's lights shine the brightest because the electrical outlet has more power. Thus, option D is correct.
What is power?Power is the amount of energy transferred or converted per unit of time.
The intensity of lights depends on the power that is provided by the current flowing over it, therefore the intensity would increase if we raise the current.
When current is increased in a light bulb, the light bulb shines brighter and the power increases.
Thus, option D is correct.
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The pH of a solution is 4.36. What is the pOH?
Answer:
9.64
Explanation:
pH + pOH = 14
Since pOH = 4.36, pH would be:
pH = 14 - pOH
pH = 14 - 4.36
pH = 9.64
The answer is 9.46
9.46 pOH
a 49.2 g sample of solid iron was heated from 16.2c to 58.9c.what ws the energy change?solve for q(heat energy).iron has a specific heat value of .4494
Answer:
944.12 J
Explanation:
To solve for the energy change we use the equation Q=mc(Delta)t
Let's identify the variables we have:
m (mass) = 49.2 g
c (specific heat) = .4494
delta t (change in temp.) = final - initial = 58.9-16.2 = 42.7 degrees Celsius
Q= (49.2)(.4494)(42.7)
= 944.12 J
How many moles do 10.0 mg of CO represent?
0.28
0.036
0.000357
0.0036
For this case we have that, according to the periodic table, the atomic mass of the Carbon is [tex]12 \frac {g} {mol}[/tex] and that of the Oxygen is[tex]16 \frac {g} {mol}.[/tex]
By definition, the number of moles is given by:
[tex]n = \frac {M} {MM}[/tex]
Where:
M: It's the mass
MM: It's the molar mass
n: It is the number of moles
10 milligrams equals to 0.01 grams
[tex]n = \frac {0.01} {12 + 16} = \frac {0.01} {28} = 0.000357[/tex]
ANswer:
Option C
Answer:
0.000357 shows how many moles 10.0 of CO represent
74. Which two temperatures are identical for the same substance?
(A) melting point, freezing point
B) melting point, boiling point
C) freezing point, boiling point
D) freezing point, condensation point
Answer:
(A) melting point, freezing point.
Explanation:
For the same substance: when matter is transitioning from solid to liquid (melting) or liquid to solid (freezing), its temperature is fixed at the melting/freezing point, which is the same temperature.
Answer:melting,freezing
Explanation:
What SI unit is used to measure the number of representative particles in a substance?
Answer:
SI unit for number of representative particle is MOLE.
Explanation:
The SI unit used to measure the number of representative particles in a substance is the mole. One mole of a substance contains Avogadro's number, or 6.02×10²³ particles. This concept is critical in chemistry calculations.
Explanation:The SI (International System) unit used to measure the number of representative particles in a substance is the mole (abbreviated mol). A mole is a convenient amount unit for expressing very large numbers of atoms or molecules. Experimental measurements have determined the number of entities composing 1 mole of a substance to be 6.022 x 10²³ , a quantity called Avogadro's number.
The mole is a versatile unit that conveniently uses scientific notation to represent large values. One mole always contains 6.02×10²³ particles, independent of the element substance. This number is also known as Avogadro’s number (NA).
A mole of any substance has a mass in grams equal to its molecular mass, which can be calculated from the atomic masses given in the periodic table of elements. These concepts help scientists do computations ranging from simple unit conversions to more complex, multi-step calculations.
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14C → 14N
Describe the type of radioactive emission produced from the decay of carbon-14 to nitrogen-14 and predict its reaction to an electric field.
A) Radioactive gamma decay is produced by the reaction. This neutral electromagnetic radiation are not attracted to the electric field.
B) Beta particles are released during the radioactive decay. These negative particles are attracted to the positive plate in the electric field.
C) During the radioactive decay, alpha particles are released. These positive particles are attracted to the negative plate in the electric field.
D) Both types of radioactive emissions, particles and electromagnetic radiation, are produced during this decay. None of these are attracted to the electric field.
Answer:
B.).Beta particles are released during the radioactive decay. These negative particles are attracted to the positive plate in the electric field.
Explanation:
The radioactive decay of C-14 yields a N-14 atom via the emission of Beta particles.
The Beta particles are negatively charged and would be attracted towards the positive plate in the electric field because like charges repel but unlike charges attracts one another.
Answer:
C
Explanation:
The answer is C if you're on USA test prep.
The molecular mass of the compound is 137.32 g/mol. What is the molecular formula of the compound?
barium , atomic number 56
Although given the molecular mass of a compound, additional information, most notably the empirical formula, is needed to determine the molecular formula.
Explanation:To determine the molecular formula of a compound with a molecular mass of 137.32 g/mol, we need additional information, specifically the empirical formula of the compound. The molecular formula is a multiple of the empirical formula, and the multiple is determined by the ratio of the molecular mass to the empirical formula mass.
For example, suppose the empirical formula is CH (which has an empirical formula mass of about 13 g/mol for C and 1 g/mol for H). If the molecular mass is 137.32 g/mol, we would divide the molecular mass by the empirical formula mass (137.32/14), which is about 9.8. This isn't a whole number, so we'd need to adjust the empirical formula. But if the empirical formula is C2H2 (with empirical formula mass of 26 g/mol), then the divisor would be 5.3, again not a whole number. Without knowing the empirical formula, we can't determine the molecular formula.
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Does it make a difference if the jar is square or round? What about the size of the jar or glass?
It’s talking about refraction*
no it doesn't make differance at all ...only the material used make difference
All of the following are examples of synthesizing extept
Answer:
There are no examples provided here, but synthesis is when two substances combine to form one! This could be shown in an chemical equation.
Explanation:
Answer:
rephrasing and rewriting to create a term paper
Explanation:
How many grams of antifreeze C2H4(OH)2 would be required per 500 g of water to prevent the water from freezing at a temperature of -20.0 C
Answer:
333.7 g.
Explanation:
The depression in freezing point of water (ΔTf) due to adding a solute to it is given by: ΔTf = Kf.m.Where, ΔTf is the depression in water freezing point (ΔTf = 20.0°C).
Kf is the molal freezing point depression constant of the solvent (Kf = 1.86 °C/m).
m is the molality of the solution.
∴ m = ΔTf/Kf = (20.0°C)/(1.86 °C/m) = 10.75 m.
molaity (m) is the no. of moles of solute per kg of the solvent.
∵ m = (no. of moles of antifreeze C₂H₄(OH)₂)/(mass of water (kg))
∴ no. of moles of antifreeze C₂H₄(OH)₂ = (m)(mass of water (kg)) = (10.75 m)(0.5 kg) = 5.376 mol.
∵ no. of moles = mass/molar mass.
∴ mass of antifreeze C₂H₄(OH)₂ = no. of moles x molar mass = (5.376 mol)(62.07 g/mol) = 333.7 g.
To prevent 500 g of water from freezing at -20.0°C, 333.86 grams of antifreeze [tex](C_2H_4(OH)_2)[/tex] are required. The calculation involves using the freezing point depression formula and converting the molality to grams. Ethylene glycol is the active component in this antifreeze scenario.
To determine how many grams of antifreeze[tex](C_2H_4(OH)_2)[/tex] are required to prevent 500 g of water from freezing at -20.0°C, we can use the freezing point depression formula [tex]\triangle T_f = i mK_f .[/tex]
Here, Δ[tex]T_f[/tex] is the freezing point depression, [tex]K_f[/tex] is the cryoscopic constant for water, and m is the molality of the solution. The constant i is the van 't Hoff factor, which is 1 for ethylene glycol because it does not dissociate in water.
Step-by-Step Explanation:Calculate the required freezing point depression:
Δ[tex]T_f[/tex] = [tex]T_f[/tex] (pure solvent) - [tex]T_f[/tex](solution) = 0°C - (-20.0°C) = 20.0°C
Use the freezing point depression formula to calculate molality:
[tex]\triangle T_f = i mK_f .[/tex]
20.0°C = 1.86°C/m * m
m = 20.0°C / 1.86°C/m = 10.75 m
Calculate the moles of antifreeze required:
molality (m) = moles of solute / kg of solvent
10.75 m = moles of [tex](C_2H_4(OH)_2)[/tex] / 0.5 kg
moles of [tex](C_2H_4(OH)_2)[/tex] = 10.75 m * 0.5 kg = 5.375 moles
Convert moles to grams using the molar mass of [tex](C_2H_4(OH)_2)[/tex] (62.07 g/mol):
grams of [tex](C_2H_4(OH)_2)[/tex] = moles * molar mass = 5.375 moles * 62.07 g/mol = 333.86 g
Therefore, 333.86 grams of antifreeze [tex](C_2H_4(OH)_2)[/tex] are needed for 500 g of water to prevent it from freezing at -20.0°C.
Igneous rocks formed below earths surface
A) igneous rocks
B) extrusive
C) intrusive
D) lava
Answer:
The answer is C. Instrusive
Explanation:
The ingneas rocks are those that form when the magma cools and reaches a solid state. When this type of volcanic rock cooling occurs below the surface of the earth's crust, it is known as intrusive rocks. This type of igneous rock is formed from the magma that has solidified, creating crystals.
Igneous rocks formed below earths surface C) intrusive.
Igneous rocks are classified based on their origin and formation process. They are formed from the solidification of molten material, known as magma or lava. When magma cools and solidifies beneath the Earth's surface, it forms intrusive igneous rocks.
Intrusive igneous rocks are characterized by their formation within the Earth's crust. The magma, which is molten rock, rises to the surface and gets trapped in underground chambers called magma chambers. As the magma cools slowly over time, the minerals within it crystallize and solidify to form intrusive igneous rocks.
The slow cooling process of the magma beneath the Earth's surface allows for the growth of large mineral crystals. The resulting rocks have a coarse-grained texture due to the visible crystals. Examples of intrusive igneous rocks include granite, diorite, and gabbro.
On the other hand, extrusive igneous rocks are formed from lava that erupts onto the Earth's surface and cools quickly. The rapid cooling prevents the growth of large crystals, resulting in a fine-grained or glassy texture. Examples of extrusive igneous rocks include basalt, andesite, and obsidian.
Therefore, the correct answer is C) intrusive, as it refers to igneous rocks formed below the Earth's surface through slow cooling of magma.
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These test tubes contain solutions of various colors, since they have been mixed with broth from red cabbage. The approximate pH values are noted.
How would you best describe the red or pink solutions labeled “2-4”?
How would you best describe the purple to blue solution labeled “7”?
How would you best describe the yellow-green solution labeled “11”?
Answer:
acidic
neutral
basic
Explanation:
Answer:
The answer and the explanation given below:
Explanation:
The pH is a scale which is used to identify a solution whether it is acidic, basic or neutral. The pH scale ranges from 0 to 14. A pH 7.0 is neutral which is of pure water. The range from 0.0 to 6.9 is acidic due to presence of a high concentration of hydrogen ions (H⁺) in the solution as compared to pure water. The range 7.1 to 14.0 is basic due to presence of a low concentration of hydrogen ions (H⁺) in the solution as compared to pure water.
The red or pink solutions labeled “2-4” will be acidic as per pH scale. The purple to blue solution labeled “7” will be neutral as per pH scale. The yellow-green solution labeled “11” will be basic or alkaline as per pH scale. When electrons are removed from an atom, the atom becomes positively charged and is referred to as a(n) _____.
anion
anode
cation
cathode
Answer:
cation.
Explanation:
A cation is an ionic species with a positive charge. The word "cation" comes from the Greek word "kato," which means "down." A cation has more protons than electrons, giving it a net positive charge.So, when electrons are removed from an atom, the atom becomes positively charged and is referred to as a cation.SUBJECT SCIENCE...... photosynthesis changes _(chemical, light, electrical) energy into _ (chemical, potential, kinetic) energy.
Answer:
light to chemical
Explanation:
Which best describes the error in data collection
Answer:
Error (statistical error) describes the difference between a value obtained from a data collection process and the 'true' value for the population. The greater the error, the less representative the data are of the population. Data can be affected by two types of error: sampling error and non-sampling error
Explanation:.
Answer:
The correct answer is the standard deviation of the sample distribution.
Explanation:
The standard error is the standard deviation of the sample distribution of a sample statistic. The term also refers to an estimate of the standard deviation, derived from a particular sample used to compute the estimate. The larger the error, the less representative the population data. Data can be affected by two types of error: sampling error and non-sampling error.
Have a nice day!
What is the pOH of 5.92x10 -2
Answer: 1.23
Explanation: Given that there is no reaction, I will assume that the molarity corresponds to that of a base.
Therefore,
All you have to do is take the negative logarithm of that molarity
Indeed, pOH = -log(5.92x10^-2) = 1.2277 = 1.23
Note:
We could also do this for the pH.
If we were finding the pH, and that we are given the molarity (also known as [OH-]), then, we would also use the negative logarithm (-log (molarity)).
If we wanted to do the opposite, we could find the molarity with the pOH using the inverse logarithm.
10^(-1.2277) = 5.92 x 10^-2